From ea3705a4f91ac96947dad8c91c67ed029acbc1ec Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?C=C3=A9dric=20Krier?= <ced@b2ck.com>
Date: Mon, 23 Nov 2020 23:37:58 +0100
Subject: [PATCH] Test if panel box-shadow is not null before using length

issue9830
review314791002
---
 src/view/tree.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/view/tree.js b/src/view/tree.js
index bf45c46575..b6e1f99624 100644
--- a/src/view/tree.js
+++ b/src/view/tree.js
@@ -33,7 +33,7 @@
             el.parents('.panel').each(function(i, panel) {
                 panel = jQuery(panel);
                 var lengths = panel.css('box-shadow').match(/\d+px/g);
-                if (lengths.length) {
+                if (lengths && lengths.length) {
                     lengths = lengths.map(function(length) {
                         return length.replace('px', '');
                     });